package main

import (
	"fmt"
	"log"
	"sync"
	"time"
)

// CBRWithEpochManagement 集成轮次管理的CBR协议
type CBRWithEpochManagement struct {
	// CBR核心功能
	dycapsProtocol *DyCAPSProtocol
	reconfiguration *ReconfigurationModule
	keyRefresh      *KeyRefreshModule
	acs             *ACSModule
	proofChain      *ProofChain
	
	// 轮次管理功能
	epochManager    *EpochManager
	performanceMonitor *PerformanceMonitor
	stateSynchronizer *StateSynchronizer
	
	// 配置
	nodeID          int
	totalNodes      int
	faultyNodes     int
	reconfigInterval int // R参数：重配置间隔
	
	// 状态
	isActive        bool
	currentEpoch    int
	membership      []string
	threshold       int
	
	// 同步
	mu sync.RWMutex
	logger *log.Logger
}

// DyCAPS协议
type DyCAPSProtocol struct {
	prepare      *Phase
	shareReduce  *Phase
	proactivize  *Phase
	shareDist    *Phase
}

type Phase struct {
	name  string
	delay time.Duration
}

// 重配置模块
type ReconfigurationModule struct {
	oldCommittee []string
	newCommittee []string
	oldThreshold int
	newThreshold int
}

// 密钥刷新模块
type KeyRefreshModule struct {
	oldKeys map[string][]byte
	newKeys map[string][]byte
}

// ACS模块
type ACSModule struct {
	secretShares map[string][]byte
	commitments  []byte
	threshold    int
}

// 证明链
type ProofChain struct {
	blocks       []*ProofBlock
	currentBlock *ProofBlock
}

type ProofBlock struct {
	BlockID      string
	EpochID      int
	ProofData    []byte
	Commitments  []byte
	Timestamp    time.Time
	PreviousHash string
	CurrentHash  string
}

// 轮次管理器
type EpochManager struct {
	currentEpoch    int
	totalEpochs     int
	reconfigInterval int
	epochLatency    time.Duration
	epochResults    []*EpochResult
}

type EpochResult struct {
	EpochID      int
	StartTime    time.Time
	EndTime      time.Time
	Success      bool
	TPS          float64
	Latency       time.Duration
	CBRExecuted  bool
	Error        error
}

// 性能监控器
type PerformanceMonitor struct {
	totalTPS        float64
	averageLatency  time.Duration
	successRate     float64
	cbrExecutions   int
	metrics         map[string]interface{}
}

// 状态同步器
type StateSynchronizer struct {
	nodeStates      map[int]*NodeState
	consensusState  *ConsensusState
	reconfigState   *ReconfigState
}

type NodeState struct {
	NodeID      int
	Epoch       int
	Status      string
	LastUpdate  time.Time
}

type ConsensusState struct {
	CurrentEpoch int
	ConsensusResult []byte
	Participants   []int
}

type ReconfigState struct {
	IsReconfiguring bool
	OldCommittee    []string
	NewCommittee    []string
	Progress        float64
}

// NewCBRWithEpochManagement 创建集成轮次管理的CBR协议
func NewCBRWithEpochManagement(nodeID, totalNodes, faultyNodes, reconfigInterval int, logger *log.Logger) *CBRWithEpochManagement {
	return &CBRWithEpochManagement{
		dycapsProtocol: NewDyCAPSProtocol(),
		reconfiguration: &ReconfigurationModule{},
		keyRefresh:      &KeyRefreshModule{},
		acs:             &ACSModule{},
		proofChain:      NewProofChain(logger),
		epochManager:    NewEpochManager(reconfigInterval),
		performanceMonitor: NewPerformanceMonitor(),
		stateSynchronizer: NewStateSynchronizer(),
		nodeID:          nodeID,
		totalNodes:      totalNodes,
		faultyNodes:     faultyNodes,
		reconfigInterval: reconfigInterval,
		isActive:        false,
		currentEpoch:    0,
		membership:      []string{},
		threshold:       0,
		logger:          logger,
	}
}

// NewDyCAPSProtocol 创建DyCAPS协议
func NewDyCAPSProtocol() *DyCAPSProtocol {
	return &DyCAPSProtocol{
		prepare:     &Phase{"Prepare", 100 * time.Millisecond},
		shareReduce: &Phase{"ShareReduce", 200 * time.Millisecond},
		proactivize: &Phase{"Proactivize", 150 * time.Millisecond},
		shareDist:   &Phase{"ShareDist", 100 * time.Millisecond},
	}
}

// NewProofChain 创建证明链
func NewProofChain(logger *log.Logger) *ProofChain {
	return &ProofChain{
		blocks:       []*ProofBlock{},
		currentBlock: nil,
	}
}

// NewEpochManager 创建轮次管理器
func NewEpochManager(reconfigInterval int) *EpochManager {
	return &EpochManager{
		currentEpoch:    0,
		totalEpochs:     0,
		reconfigInterval: reconfigInterval,
		epochLatency:    0,
		epochResults:    []*EpochResult{},
	}
}

// NewPerformanceMonitor 创建性能监控器
func NewPerformanceMonitor() *PerformanceMonitor {
	return &PerformanceMonitor{
		totalTPS:       0,
		averageLatency: 0,
		successRate:    0,
		cbrExecutions:  0,
		metrics:        make(map[string]interface{}),
	}
}

// NewStateSynchronizer 创建状态同步器
func NewStateSynchronizer() *StateSynchronizer {
	return &StateSynchronizer{
		nodeStates:     make(map[int]*NodeState),
		consensusState: &ConsensusState{},
		reconfigState:  &ReconfigState{},
	}
}

// Start 启动集成轮次管理的CBR协议
func (cbr *CBRWithEpochManagement) Start() error {
	cbr.logger.Printf("[CBR-Epoch] 启动集成轮次管理的CBR协议")
	
	// 启动轮次管理
	if err := cbr.epochManager.Start(); err != nil {
		return fmt.Errorf("启动轮次管理失败: %v", err)
	}
	
	// 启动性能监控
	if err := cbr.performanceMonitor.Start(); err != nil {
		return fmt.Errorf("启动性能监控失败: %v", err)
	}
	
	// 启动状态同步
	if err := cbr.stateSynchronizer.Start(); err != nil {
		return fmt.Errorf("启动状态同步失败: %v", err)
	}
	
	cbr.isActive = true
	cbr.logger.Printf("[CBR-Epoch] 集成轮次管理的CBR协议启动成功")
	
	return nil
}

// ExecuteEpoch 执行一个轮次
func (cbr *CBRWithEpochManagement) ExecuteEpoch(epoch int) error {
	cbr.mu.Lock()
	defer cbr.mu.Unlock()
	
	cbr.logger.Printf("[CBR-Epoch] 执行轮次 %d", epoch)
	
	// 1. 轮次管理：更新当前轮次
	cbr.epochManager.UpdateEpoch(epoch)
	
	// 2. 检查是否需要执行CBR
	shouldExecuteCBR := cbr.epochManager.ShouldExecuteCBR(epoch)
	
	if shouldExecuteCBR {
		cbr.logger.Printf("[CBR-Epoch] 轮次 %d 需要执行CBR", epoch)
		
		// 执行CBR DyCAPS协议
		if err := cbr.executeDyCAPSProtocol(epoch); err != nil {
			return fmt.Errorf("CBR DyCAPS协议失败: %v", err)
		}
		
		// 更新性能监控
		cbr.performanceMonitor.RecordCBRExecution(epoch)
		
		// 更新状态同步
		cbr.stateSynchronizer.UpdateReconfigState(epoch, true)
	} else {
		// 更新状态同步
		cbr.stateSynchronizer.UpdateReconfigState(epoch, false)
	}
	
	// 3. 更新证明链
	if err := cbr.proofChain.AddBlock(epoch, "epoch_proof"); err != nil {
		return fmt.Errorf("ProofChain更新失败: %v", err)
	}
	
	// 4. 记录轮次结果
	cbr.epochManager.RecordEpochResult(epoch, true, 0, shouldExecuteCBR)
	
	cbr.currentEpoch = epoch
	return nil
}

// executeDyCAPSProtocol 执行DyCAPS四阶段协议
func (cbr *CBRWithEpochManagement) executeDyCAPSProtocol(epoch int) error {
	cbr.logger.Printf("[CBR-Epoch] 执行DyCAPS四阶段协议，轮次: %d", epoch)
	
	// 阶段1: Prepare
	cbr.logger.Printf("[CBR-Epoch] 执行阶段: %s", cbr.dycapsProtocol.prepare.name)
	time.Sleep(cbr.dycapsProtocol.prepare.delay)
	cbr.logger.Printf("[CBR-Epoch] 阶段 %s 完成", cbr.dycapsProtocol.prepare.name)
	
	// 阶段2: ShareReduce
	cbr.logger.Printf("[CBR-Epoch] 执行阶段: %s", cbr.dycapsProtocol.shareReduce.name)
	time.Sleep(cbr.dycapsProtocol.shareReduce.delay)
	cbr.logger.Printf("[CBR-Epoch] 阶段 %s 完成", cbr.dycapsProtocol.shareReduce.name)
	
	// 阶段3: Proactivize
	cbr.logger.Printf("[CBR-Epoch] 执行阶段: %s", cbr.dycapsProtocol.proactivize.name)
	time.Sleep(cbr.dycapsProtocol.proactivize.delay)
	cbr.logger.Printf("[CBR-Epoch] 阶段 %s 完成", cbr.dycapsProtocol.proactivize.name)
	
	// 阶段4: ShareDist
	cbr.logger.Printf("[CBR-Epoch] 执行阶段: %s", cbr.dycapsProtocol.shareDist.name)
	time.Sleep(cbr.dycapsProtocol.shareDist.delay)
	cbr.logger.Printf("[CBR-Epoch] 阶段 %s 完成", cbr.dycapsProtocol.shareDist.name)
	
	cbr.logger.Printf("[CBR-Epoch] DyCAPS四阶段协议完成")
	return nil
}

// 轮次管理器方法
func (em *EpochManager) Start() error {
	em.currentEpoch = 0
	em.totalEpochs = 0
	return nil
}

func (em *EpochManager) UpdateEpoch(epoch int) {
	em.currentEpoch = epoch
	em.totalEpochs++
}

func (em *EpochManager) ShouldExecuteCBR(epoch int) bool {
	return epoch%em.reconfigInterval == 0
}

func (em *EpochManager) RecordEpochResult(epoch int, success bool, latency time.Duration, cbrExecuted bool) {
	result := &EpochResult{
		EpochID:     epoch,
		StartTime:   time.Now().Add(-latency),
		EndTime:     time.Now(),
		Success:     success,
		TPS:         0, // 需要实际计算
		Latency:    latency,
		CBRExecuted: cbrExecuted,
		Error:      nil,
	}
	
	em.epochResults = append(em.epochResults, result)
}

// 性能监控器方法
func (pm *PerformanceMonitor) Start() error {
	pm.totalTPS = 0
	pm.averageLatency = 0
	pm.successRate = 0
	pm.cbrExecutions = 0
	return nil
}

func (pm *PerformanceMonitor) RecordCBRExecution(epoch int) {
	pm.cbrExecutions++
	pm.metrics[fmt.Sprintf("cbr_epoch_%d", epoch)] = time.Now()
}

// 状态同步器方法
func (ss *StateSynchronizer) Start() error {
	ss.nodeStates = make(map[int]*NodeState)
	ss.consensusState = &ConsensusState{}
	ss.reconfigState = &ReconfigState{}
	return nil
}

func (ss *StateSynchronizer) UpdateReconfigState(epoch int, isReconfiguring bool) {
	ss.reconfigState.IsReconfiguring = isReconfiguring
	ss.reconfigState.Progress = 0.0
}

// 证明链方法
func (pc *ProofChain) AddBlock(epoch int, proofData string) error {
	block := &ProofBlock{
		BlockID:      fmt.Sprintf("block_%d", epoch),
		EpochID:      epoch,
		ProofData:    []byte(proofData),
		Commitments:  []byte("commitments"),
		Timestamp:    time.Now(),
		PreviousHash: pc.getPreviousHash(),
		CurrentHash:  fmt.Sprintf("hash_%d", epoch),
	}
	
	pc.blocks = append(pc.blocks, block)
	pc.currentBlock = block
	
	return nil
}

func (pc *ProofChain) getPreviousHash() string {
	if len(pc.blocks) == 0 {
		return "genesis"
	}
	return pc.blocks[len(pc.blocks)-1].CurrentHash
}

// 测试集成轮次管理的CBR协议
func testCBRWithEpochManagement() {
	fmt.Println("=== 集成轮次管理的CBR协议测试 ===")
	fmt.Println("")
	
	// 创建日志器
	logger := log.New(log.Writer(), "[CBR-Epoch] ", log.LstdFlags)
	
	// 创建集成轮次管理的CBR协议实例
	cbr := NewCBRWithEpochManagement(0, 6, 2, 10, logger) // R=10
	
	// 启动CBR协议
	if err := cbr.Start(); err != nil {
		fmt.Printf("❌ 启动失败: %v\n", err)
		return
	}
	
	fmt.Println("✅ 集成轮次管理的CBR协议启动成功")
	fmt.Println("")
	
	// 模拟执行多个轮次
	epochs := []int{1, 5, 10, 15, 20, 25, 30}
	
	for _, epoch := range epochs {
		fmt.Printf("🔄 执行轮次 %d\n", epoch)
		
		if err := cbr.ExecuteEpoch(epoch); err != nil {
			fmt.Printf("   ❌ 轮次 %d 执行失败: %v\n", epoch, err)
		} else {
			shouldCBR := cbr.epochManager.ShouldExecuteCBR(epoch)
			if shouldCBR {
				fmt.Printf("   ✅ 轮次 %d 执行成功 (包含CBR DyCAPS协议)\n", epoch)
			} else {
				fmt.Printf("   ✅ 轮次 %d 执行成功\n", epoch)
			}
		}
		fmt.Println("")
	}
	
	fmt.Println("🎉 集成轮次管理的CBR协议测试完成!")
	fmt.Println("")
	fmt.Println("📊 集成功能特点:")
	fmt.Println("✅ 轮次管理集成到CBR中")
	fmt.Println("✅ 性能监控集成到CBR中")
	fmt.Println("✅ 状态同步集成到CBR中")
	fmt.Println("✅ 证明链与CBR紧密耦合")
	fmt.Println("✅ 架构更加统一高效")
}

func main() {
	testCBRWithEpochManagement()
}
